Me and my bf have been dating for a year and still going strong, at 1st he came up behind me, grabbed my waist and kissed my neck, its a real turn on for both guys and girls xD. it feels really good in a public place around your friends :) and almost everytime, the girl will turn round and kiss you xD. you could also try different techniques and include some upper/lower body fondling. the girls love it
Hope this helped,,